1. Assertion : Plants excrete various waste products during their life processes. Reason : They produce urea just like humans. (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason true but Reason is not the correct explanation of Assertion. (c) Assertion is true but Reason is false, (d) Assertion is false but Reason is true. Sol : www.cbse,site/sc/fm301 are
Answers
Explanation:
Like human beings and other organisms, plants also excrete various waste products during their life processes. ... Urea is produced in humans liver and excreted in the form of urine through urethra. Plants do not produce urea. Thus, Assertion is true, but Reason is false.
The assertion (A) is correct, but the reason (R) is incorrect.
Urea is produced only by humans and animals and is excreted in a semi-solid state. Plants also excrete wastes during their life processes. However, their waste products are not in the form of urea.
The waste products of plants are oxygen, carbon dioxide and water vapour.
- Oxygen is given out as a by-product during photosynthesis. It is not useful for plants.
- Though carbon dioxide is useful for plants, excess carbon dioxide is released into the atmosphere.
- Excess water is also given out by plants.
All these three waste products are released through the stomata (openings present on the surface of the leaf), and are given out in the gaseous state.
Therefore, plants excrete wastes, but it is not urea.
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